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Calì, Andrea and Martinenghi, D. and Torlone, R. (2015) Processing keyword queries under access limitations. In: Cardoso, J. and Guerra, F. and Houben, G.-J. and Pinto, A.M. and Velegrakis, Y. (eds.) Semantic Keyword-based Search on Structured Data Sources. Lecture Notes in Computer Science 9398. New York, U.S.: Springer, pp. 30-35. ISBN 9783319279312.
Calì, Andrea and Razgon, Igor (2014) Complexity of conjunctive query answering under access limitations (preliminary report). In: Greco, S. and Picariello, S. (eds.) 22nd Italian Symposium on Advanced Database Systems. New York, U.S.: Curran Associates, pp. 256-263. ISBN 9781634391450.